Attention:
v If your system is powered on and doing I/O operations, you must power off the
control enclosures correctly to ensure that no data is lost. If possible, always use
the fix procedures that are presented by the management GUI to manage and
maintain your system. The fix procedures ensure that node canisters are
powered off safely.
v If the system includes two control enclosures, some volumes might become
inaccessible when a control enclosure shuts down. Refer to “Procedure:
Understanding Storwize V7000 Gen2 volume dependencies” on page 286 to
determine whether it is appropriate to continue this procedure.
v If you need to power off the node canister that is operating as the configuration
node, power down the other node canister first and then power down the
configuration node second when following this procedure. This prevents two
failovers from happening, reducing delays in powering off the control enclosure.
Procedure
To power off a control enclosure, complete the following steps:
1. Use the management GUI to determine which two node canisters are in the
control enclosure that is to be powered off. Note whether one of the two nodes
is the configuration node so that you can power it off second.
2. Go to the service assistant for the first node to be powered off.
3. On the home page, select the node canister to be powered off.
4. Use the Power off action to power off the canister.
5. Wait for the node to appear offline.
6. Repeat steps 2 through 5 on the second node canister in the enclosure that is to
be powered off.
7. If another control enclosure in the system is online, the management GUI can
be used to confirm that the node status of both nodes is offline. The status
LEDs on both canisters indicate whether the node is powered off, as described
in “Procedure: Understanding the Storwize V7000 Gen2 system status from the
LEDs” on page 256.
8. Turn off the power to the enclosure and disconnect both power cables from the
enclosure.
What to do next
After powering off a control enclosure using this procedure, you must reconnect
the power cables and turn the power on. The node canisters will start.
Procedure: Powering off a Storwize V7000 Gen2 node canister
You can safely power off a node canister to service the node canister.
About this task
Attention: After powering off a node canister using this procedure, a physical
reseat of the canister will be required to power it back on. The reseat procedure
requires physical access to the enclosure and is described in “Procedure: Reseating
a Storwize V7000 Gen2 node canister” on page 278.
While a node canister is powered off, some volumes can become inaccessible. Refer
to “Procedure: Understanding Storwize V7000 Gen2 volume dependencies” on
page 286 to determine whether it is appropriate to continue this procedure.
282 Storwize V7000 Unified: Problem Determination Guide 2073-720
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